Fraggles
Fragments of pages that a search system can index, rank and surface independently, as answer-sized units rather than whole documents. Coined by Cindy Krum and the MobileMoxie team around 2019 to 2020.
What it actually means
A page is not necessarily retrieved as a page. A section, a paragraph, a table row can be pulled out and presented on its own, linked back with a jump to the exact position.
Once that is the retrieval unit, page-level optimisation is the wrong granularity. The question becomes whether any individual passage stands up alone, without the surrounding context to explain it.
Why it predicted how AI answers work
Retrieval-augmented systems chunk documents and retrieve chunks. That is the same behaviour Krum named years earlier, arrived at from a different direction.
The practical advice follows directly and has not changed: write passages that make sense in isolation, answer one question per section, and do not rely on the paragraph above to establish what you are talking about.